icons: icon.html draws a fixed box at the requested size (?s=512) so the runner's screenshot crop is exact

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6897PWcUEwHiqZMcVnNF6

icons/icon.html

@@ -1,5 +1,6 @@
 <!doctype html>
 <meta charset="utf-8">
 <title>icon</title>
-<style>html,body{margin:0;height:100%;background:#0b0b0e;overflow:hidden}img{display:block;width:100vmin;height:100vmin}</style>
-<img src="icon.svg" alt="">
+<style>html,body{margin:0;background:#0b0b0e;overflow:hidden}img{position:absolute;left:0;top:0;display:block}</style>
+<img id="i" src="icon.svg" alt="">
+<script>const s=+new URLSearchParams(location.search).get("s")||512;const i=document.getElementById("i");i.width=s;i.height=s;i.style.width=i.style.height=s+"px";</script>